Why are camps REDUCING production?

I've built a couple of camps and it adds 1 or 2 gold, but actually removes a production.

Is this a bug? (I'm Maori). What's the thinking here, surely this will encourage many people to just stop building camps?

I can't find mention of this anywhere in Google. Thanks.


No, this is not a bug.

The ability "Mana" provides +1 production to unimproved forests and rainforests respectively +2 with the Conservation civic.

Since you are improving the tile by adding a camp, you lose this bonus.